Department of Physical Therapy, Graduate Course of Rehabilitation Science, School of Health Sciences, College of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, 5-11-80, Kodatsuno, Kanazawa, Ishikawa, Japan; Department of Rehabilitation, Japanese Red Cross Kanazawa Hospital, Ishikawa, Japan.
Department of Community-based-Rehabilitation, Nanto Municipal Hospital, Toyama, Japan.
Med Eng Phys. 2024 Sep;131:104224. doi: 10.1016/j.medengphy.2024.104224. Epub 2024 Aug 14.
This study aimed to measure trunk rotation angle representations from images using a single camera combined with a posture mirror and to examine its reliability and validity. We applied a trunk rotation angle model using a tripod and markers simulating trunk rotation. We compared two methods of trunk rotation angle measurement: the conventional method from the superior aspect using a manual goniometer and a novel measurement method using images from a digital camera and a posture mirror. Measurement error was calculated as the average absolute error between the angle measured by the goniometer and that calculated from the camera and mirror image. The intraclass correlation coefficient (ICC 1, 1) and ICC (2, 1) were calculated as the intra-rater reliability and agreement between the measurement angles of the two methods, respectively. Systematic errors of the angles measured by the two methods were examined by a Bland‒Altman analysis. The mean (SD) of the mean absolute error was 1.17° (0.71°). ICC (1, 1) was 0.978, and ICC (2, 1) was 0.991. The Bland‒Altman analysis showed no systematic errors. The results suggest the validity and accuracy of our novel method to measure the angle of trunk rotation, which does not require high-cost equipment or a special environment.
本研究旨在使用结合姿势镜的单摄像机测量来自图像的躯干旋转角度表示，并检验其可靠性和有效性。我们应用了一种使用三脚架和标记模拟躯干旋转的躯干旋转角度模型。我们比较了两种躯干旋转角度测量方法：一种是使用手动量角器从上方测量的传统方法，另一种是使用数字摄像机和姿势镜拍摄图像的新测量方法。测量误差计算为量角器测量的角度与从摄像机和镜子图像计算出的角度之间的平均绝对误差。组内相关系数 (ICC 1,1) 和 ICC (2,1) 分别计算为两种方法的测量角度的内部一致性和一致性。通过 Bland–Altman 分析检查两种方法测量的角度的系统误差。平均绝对误差的平均值 (SD) 为 1.17°(0.71°)。ICC (1,1) 为 0.978，ICC (2,1) 为 0.991。Bland–Altman 分析显示没有系统误差。结果表明，我们的新型测量躯干旋转角度的方法具有有效性和准确性，不需要昂贵的设备或特殊的环境。
